Bobbin-case for sewing-machines.



J. S. F|NCH. BOBBIN CASE FOR SEWING MACHINES.

APPLICATION FILED DEC- 30 I913.

Patnted Sept. 5,1916.

IN VENTOR A TTORNE I WITNESSES:

,1 f *1 a a a r J k l JOHN s. FINCH, or BRIDZGEPORT, oONNEc'rIcUT, ASSIGNOR TO THE sINGERmANUEAo- TUBING COMPANY, A conroEArIoN on NEW JERSEY.

eaaao.

Specification of Letters Patent.

Patented Sept. 5, 1916.

- Application filed December 30, 1913. Serial No. 809,438.

To all whom it may concern Be it known that I, JoHN S. FINCH, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Bobbin- Cases for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has especial relation to improvements in two-part bobbin cases held against rotation, the base or inner portion being journaled in the loop-taker while the outer or cover portion is removably secured to the base by a suitable latch, the two parts when secured together forming a receptacle in which the bobbin is rotatably mounted on a pin extending out from the base, the pin forming one member of the latch device.

In the use of bobbin-cases corresponding to the subject of the present improvement it frequently happens, especially when employed in machines operated at high speed, that the loop of needle thread in passing around the bobbin-case is accidentally drawn by the take-up between the divisional walls,

- as'the outer half or member of the loop, in

its travel about the bobbin-case, is practically unprotected except as the bobbin-case is provided with means forshedding it.

Referring to the'drawings, Figure 1, is a front elevation of one form of commonly employed loop-taker into which is journaled a two-part bobbin-case equipped with the present invention, the retaining gib bein shown in osition to permit of the remov of the bob in-case. Fig. 2, a perspective of the bobbin-case base, Figs. 3 and 1, inner and perspective views, respectively, of the bobbin-case cap. Fig. 5, a section through the bobbin-case on the line mw, Fig. 1.

Referring to the figures, 1 represents the loop-taker shown in Fig. 1 in position to carry the front half portion of the needle thread loop to the rear side of the bobbincase, in a manner common to rotary loo takers which cast the thread-loop about t e bobbin case without its passing through said loop, 2 the bobbin-case baseprovided with.

the flange 3 which tracks the groove or guideway 4: formed in said loop-taker, 5 the gib for holding said bobbin-case base against displacement in said loop-taker, 6 the bobbin-case cap secured to said base by a sliding latch 7 entering an annular groove 8 formed in the stud or pin 9 carried by the I plate 2, the oppositely arranged movements of the latch being controlled by the hinged plate 10 in a manner common to bobbin cases of the present class, 11 the bobbin which is shown as provided with a mass of thread 12, and 13 denotes a lug formed integral with and at right angles to the latch 7, which, when the latter is moved in opposition to the resiliency of the spring 14, grips the edge of the bobbin and holds the latter against displacement in the cap while being removed from the stud 9.

The bobbin-case base 2 is provided with a bobbin-case stop 15 which'f-flcooperates with the member 16 (shown injdotted line only, Fig. 1) depending from the throat-plate 17 to hold the bobbin-case against axial movement in the direction of rotation of the looptaker, said stop comprising an integral part of said base extending out from its periph ery with its free end inclined in an opposite" direction in the form of a loop, said base be-.

rib 18 later to be reat 20 to receive the base 21 of th stop 15,

and about a portion of its free edge to form the flange 22 which latter enters ust inside of the rib 18 with the edge 23 resting on the top of said rib. The under thread is passed from the bobbin through the opening 24, un-

der'the free end of the spring 25 secured by screw 26, returning through the opening 27 and again outward through the opening 28 and into the fabric as shown in Fig. 1, the screw 29 acting to regulate the degree of tension given the thread, and 30 denotes a spring guard for protecting the outer arm of the thread loop from coming into contact with the spring 25 and its attaching screws.

Important to the present construction is the providing of a bobbin-case in which all of the openings are protected against accidentally engaging the thread loop in its travel about the bobbin-case, as pointed out in the preamble, and to this end the outer, surfaces, as 31, of the thicker portion of the rim comprise cylindrical surfaces having the same radii as the outer surface of the base 21 of the bobbin-case stop, the oppositely arranged edges, as 32, of said base being arranged in a line corresponding substantially with the axis of the stud 9 and comprising a continuation of the circular edge 33 of said stop, the edges, as 32, normally lie within the walls, as 32, of the bobbin-case cover 6, the lug 34 forming a part of the bobbin-- case rim and having the same radius as the surfaces 21 and 31 and when in-stitch-form ing position occupies the notch or opening 35, thus locating the divisional Wall 36 of said lug and the coacting wall 37 of said notch out of the line of travel of the front half of the thread loop.

The employment of the lug 34 and coacting notch 35 while desirable is not essential to the increased utility eflected by the present improved means, for if such features in construction were dispensed with the thread loop ,would not be forced into the openings, as 38, unless in connection with possible but improbable conditions of stitchformation.

meaeeo Having thus set forth the nature of the invention what I claim herein is In a bobbin-case for sewing machines, the combination with a base portion having a bobbin-holding stud and bobbin-case stop, of a bobbin-case cap provided with a circular rim cut away for a portion of its thickness mm s. FINCH.

Witnesses STANLEY N. SMITH,

E. B. ALLEN, 

